These sturdy nylon stand-offs are very handy for mounting a brushless motor in front of a firewall.
We have used these 1/2" outside diameter stand-offs on motors weighing up to 14 ounces (.60 nitro class).
Stand-offs dimensions: 1/2" outside diameter x 0.164" inside diameter (#8 screw).
Set includes four of each length stand-off: 1 inch, 1/2 inch, 1/4 inch.
The pictures below show how these spacers can be used:
(x-mount not included)
(motor,x-mount and airplane model not included)